KR20230087273A - Electric motor assembly - Google Patents

Abstract

The present invention relates to a motor assembly, comprising: an impeller; a first diffuser disposed downstream of the impeller; a second diffuser provided downstream of the first diffuser; an impeller cover coupled to the second diffuser to accommodate the impeller and the first diffuser therein; and a motor provided at a downstream side of the second diffuser to rotate and drive the impeller, wherein the second diffuser includes a hub, an outer wall concentrically disposed outside the hub, and one side connected to the hub, The other side has a plurality of blades connected to the outer wall, the impeller cover is coupled to the outer wall of the second diffuser, and the hub of the second diffuser has a communication portion for communicating the inside and outside of the hub of the second diffuser. It is composed by providing As a result, heated air can be discharged to the outside of the diffuser, and cooling of the motor can be accelerated.

Description

Motor assembly {ELECTRIC MOTOR ASSEMBLY}

The present invention relates to a motor assembly.

As is well known, a motor is a device that converts electrical energy into mechanical energy.

The motor includes a regular stator and a rotor rotatably arranged with a predetermined air gap (AIR GAP) with respect to the stator.

The size and weight of the motor vary depending on the purpose of use.

Some of the motors are composed of motor assemblies equipped with impellers to generate pressure or promote the movement of air during rotation.

However, in a motor assembly having such an impeller, the air volume can be reduced when the sizes of the stator and the rotor are reduced.

In a motor assembly having such an impeller, when the sizes of the stator and the rotor are reduced, a method of increasing the number of revolutions of the rotor may be used to maintain the same air volume.

However, in the motor assembly having such an impeller, there is a problem that the temperature of the stator and the rotor is excessively increased when the number of revolutions of the impeller and the rotor is increased.

In addition, when the number of rotations of the impeller and the rotor is increased, the amount of displacement of the bearing supporting the rotational shaft increases by that much, so there is a problem that the life of the bearing is shortened by that much.

In addition, when the number of revolutions of the impeller and the rotor is increased, the strength of the support for supporting the rotating shaft of the rotor is further reduced due to the reduction in the size of the stator and the rotor, so that the wear of the bearing is increased by that much. .

In addition, when a part of the air passing through the impeller is moved toward the stator and the rotor to cool the stator and the rotor, there is a problem in that the flow resistance of the air increases and the output (efficiency) of the motor is lowered.

KR 1020130005653 A KR 1020110048796 A

Accordingly, an object of the present invention is to provide a motor assembly capable of discharging heated air to the outside of a diffuser.

In addition, another object of the present invention is to provide a motor assembly capable of suppressing generation of vibration of a bearing.

In addition, another object of the present invention is to provide a motor assembly capable of promoting cooling of a bearing.

In addition, another object of the present invention is to provide a motor assembly capable of increasing a heat exchange area of a bearing.

In the motor assembly according to the present invention for solving the above problems, a first diffuser and a second diffuser are provided on the downstream side of the impeller, and the hub of the second fuser has an inside and outside of the hub of the second diffuser. It is characterized by a technical feature that a communication unit for communicating is provided.

More specifically, a first diffuser and a second diffuser are provided on the downstream side along the axial direction of the impeller, and a motor is provided on the downstream side of the second diffuser, and the second diffuser has the inside of the hub of the second diffuser. and a communication part communicating with the outside, so that air inside the hub of the second diffuser heated by the motor can be discharged to the outside of the second diffuser through the communication part.

Here, an impeller cover is provided outside the impeller and the first diffuser.

The impeller cover has a downstream end coupled to an outer wall of the second diffuser.

According to this configuration, an air flow path having a relatively low pressure is formed between the inside of the impeller cover and the outside of the hub of the second diffuser.

As a result, the air inside the hub of the second diffuser, which has a relatively high pressure, is quickly moved to the air passage through the communication part, and the air flow moving toward the communication part while being in contact with the motor inside the hub By being formed, cooling of the motor can be accelerated.

In addition, since the motor can maintain a relatively low temperature during operation, adverse effects caused by high temperatures can be reduced.

The first diffuser includes a hub and a plurality of blades provided around the hub.

Accordingly, since the first diffuser is not provided with an outer wall at an outer end along the radial direction of the plurality of blades, a mold for forming the plurality of blades can be approached in the radial direction of the first diffuser, Manufacturing of the first diffuser may be facilitated.

In general, when the temperature of a motor is high, the electrical resistance of the stator coil may increase and the output may decrease. However, since the motor of this embodiment maintains a relatively low temperature during operation, the increase in the electrical resistance of the stator coil is suppressed and output this can be improved.

The second diffuser is provided with a bearing accommodating part accommodating a bearing supporting the rotating shaft of the motor.

Thereby, cooling of the bearing can be accelerated.

In addition, the second diffuser is formed of a member having better thermal conductivity than the first diffuser.

Accordingly, heat dissipation of the second diffuser is accelerated, and cooling of the bearing may be further accelerated.

A motor assembly according to an embodiment of the present invention includes an impeller; a first diffuser disposed downstream of the impeller; a second diffuser provided downstream of the first diffuser; an impeller cover coupled to the second diffuser to accommodate the impeller and the first diffuser therein; and a motor provided at a downstream side of the second diffuser to rotate and drive the impeller, wherein the second diffuser includes a hub, an outer wall concentrically disposed outside the hub, and one side connected to the hub, The other side has a plurality of blades connected to the outer wall, the impeller cover is coupled to the outer wall of the second diffuser, and the hub of the second diffuser has a communication portion communicating the inside and outside of the hub of the second diffuser. are provided

Accordingly, air between the second diffuser and the motor may be discharged to the outside of the second diffuser through the communication part.

According to this configuration, air heated by the motor can be discharged to the outside of the second diffuser through the communication part during driving, so that cooling of the motor can be accelerated.

Here, since the impeller cover is coupled to the outer wall of the second diffuser, since an air flow path having a relatively low pressure is formed outside the hub of the second diffuser, the air inside the hub of the second diffuser has a relatively high pressure. is quickly moved to the air passage through the communication part, so that cooling of the motor can be accelerated.

In addition, since the motor can maintain a relatively low temperature during operation, adverse effects caused by high temperatures can be reduced.

In general, when the temperature of a motor is high, the electrical resistance of the stator coil increases and the output may decrease. However, since the motor of this embodiment maintains a relatively low temperature during operation, the increase in the electrical resistance of the stator coil is suppressed and the output is increased. can be improved.

In addition, since the first diffuser and the second diffuser can be manufactured separately, manufacturing of the diffuser can be facilitated.

In particular, since the first diffuser has a plurality of blades around the hub and no outer wall is provided outside the plurality of blades of the first diffuser, the first diffuser can be easily manufactured.

In one embodiment of the present invention, the first diffuser includes a tubular hub having one side opened along an axial direction and a plurality of blades provided on an outer wall of the hub, and the hub of the second diffuser comprises the hub of the second diffuser. The hub of the first diffuser is inserted into and coupled to the inside of the first diffuser so as to be in surface contact with it.

Accordingly, bonding force between the first diffuser and the second diffuser may be improved.

According to this configuration, deformation of the first diffuser and the second diffuser can be suppressed when an external force is applied to the first diffuser and the second diffuser.

In one embodiment of the present invention, the impeller has a hub and a plurality of radially projecting and circumferentially spaced blades around the hub.

The impeller has a conical shape.

The impeller is configured to gradually increase in outer diameter from the upstream end toward the downstream end.

In one embodiment of the present invention, the hub of the second diffuser is provided with a bearing receiving portion.

As a result, the support strength is increased by the hub of the first diffuser coupled to the bearing accommodating portion to be in surface contact with each other, so that deformation can be suppressed.

In one embodiment of the present invention, the second diffuser is formed of a member superior in thermal conductivity compared to the first diffuser.

Accordingly, cooling of the bearing accommodating portion and the bearing may be accelerated.

In one embodiment of the present invention, the first diffuser may be formed of a synthetic resin member, and the second diffuser may be formed of a metal member.

Here, the second diffuser may be formed of an aluminum member.

Accordingly, cooling of the bearing accommodating portion and the bearing may be further promoted.

In one embodiment of the present invention, the second diffuser is provided with a heat dissipation fin protruding to increase the surface area.

As a result, cooling of the bearing may be further accelerated.

In one embodiment of the present invention, the radiating fin is configured to include a radial radiating fin having one end connected to the circumference of the bearing accommodating portion and the other end disposed in a radial direction.

Accordingly, heat dissipation of the thermal energy of the bearing accommodating portion may be promoted through the radial direction radiating fin.

In addition, one end of the bearing accommodating part is supported by the radial radiating fin connected to the circumference of the bearing accommodating part, so that support strength of the bearing accommodating part may be increased.

According to this configuration, occurrence of vibration and displacement of the bearing provided inside the bearing accommodating portion is suppressed, and thus occurrence of abrasion of the bearing can be suppressed.

In one embodiment of the present invention, the radiating fins include circumferential radiating fins disposed along the circumferential direction on the inner surface of the hub of the second diffuser.

Accordingly, the stiffness of the hub of the second diffuser may be increased.

According to this configuration, occurrence of vibration and displacement of the bearing provided in the bearing accommodating portion is suppressed, and occurrence of abrasion of the bearing can be suppressed.

In addition, heat dissipation of thermal energy of the bearing accommodating portion may be accelerated, and thus cooling of the bearing provided in the bearing accommodating portion may be promoted.

In one embodiment of the present invention, the motor includes a stator and a rotor rotatably disposed inside the stator, and a stator coupling portion coupled to the stator is provided at a hub of the second diffuser.

Accordingly, the bonding force between the stator and the second diffuser can be stably achieved.

In one embodiment of the present invention, the stator coupling portion is composed of a plurality of spaced apart along the circumferential direction of the stator.

Accordingly, bonding force between the stator and the second diffuser may be increased.

Here, the stator coupling part is configured to include an outer circumferential surface contacting part that comes into surface contact with the outer circumferential surface of the stator.

Accordingly, the coupled state of the stator and the second diffuser can be more stably maintained.

In one embodiment of the present invention, the stator coupling portion includes an end surface contact portion that is in surface contact with one end of the stator along an axial direction.

Accordingly, occurrence of axial clearance between the stator and the second diffuser may be suppressed.

In one embodiment of the present invention, one end of the stator coupling portion is connected to the bearing accommodating portion and the other end is configured to have a radial section extending in the radial direction.

Accordingly, the rigidity of the bearing accommodating portion may be further increased.

In one embodiment of the present invention, the stator coupling portion has an axial section extending axially from the radial section, and the outer circumferential contact portion is formed on an inner surface of the axial section.

Accordingly, bonding force between the second diffuser and the stator may be further improved.

In one embodiment of the present invention, the end face contact portion is formed in the axial section so as to protrude more inward along the radial direction than the outer circumferential contact portion.

Accordingly, the bearing accommodating portion of the second diffuser is spaced apart from the end of the stator by a preset distance.

According to this configuration, the temperature rise of the bearing accommodating portion and the bearing due to heat generation of the stator coil can be suppressed.

In one embodiment of the present invention, the second diffuser is configured to include the stator coupling portion and the heat radiation fin.

As a result, the stiffness of the second diffuser can be improved and the heat dissipation area can be increased.

The stator coupling portion is configured to have a relatively large size compared to the heat dissipation fin.

Specifically, the width of the stator coupling portion in the circumferential direction is significantly larger than that of the heat dissipation fin in the circumferential direction.

In addition, the height (width) of the stator coupling portion along the axial direction is the same as the height (width) of the heat dissipation fin along the axial direction, or the height along the axial direction of the stator coupling portion is greater than the height along the axial direction of the heat dissipation fin. is formed

The stator coupling portion is implemented in three pieces, and the radial direction heat dissipation fins are respectively provided between radial sections of the stator coupling portion adjacent to each other along a circumferential direction.

The circumferential heat dissipation fins are respectively provided between radial sections of the stator coupling portions adjacent to each other along the circumferential direction.

The radial radiating fins are connected by the circumferential radiating fins.

With this configuration, the stiffness of the second diffuser can be remarkably improved.

In addition, the heat dissipation area of the second diffuser can be remarkably increased.

In one embodiment of the present invention, the first diffuser and the second diffuser each have a fastening member insertion hole through which the fastening member can be inserted along the axial direction.

Here, a fastening member is coupled to the hub of the first diffuser and the hub of the second diffuser coupled to be in surface contact with each other so that the hub of the first diffuser and the hub of the second diffuser are integrally coupled.

Accordingly, bonding force between the first diffuser and the second diffuser may be further improved.

In one embodiment of the present invention, two adjacent blades of the plurality of blades of the first diffuser along the circumferential direction are arranged such that an upstream end and a downstream end overlap along the axial direction.

Specifically, upstream ends of the plurality of blades of the first diffuser are disposed spaced apart from each other by a preset distance along the circumferential direction of the first diffuser, and each downstream end of the plurality of blades is inclined with respect to the axial direction of the first diffuser. 1Extends along the circumferential direction of the diffuser.

Accordingly, each downstream end of the plurality of blades overlaps an upstream end of another adjacent blade by a preset length.

Accordingly, the flow rate of the air moved by the impeller may decrease and the static pressure may increase.

In one embodiment of the present invention, in the plurality of blades of the second diffuser, an upstream end and a downstream end adjacent to each other among two adjacent blades along the circumferential direction are spaced apart from each other along the circumferential direction.

Specifically, upstream ends of the plurality of blades of the second diffuser are spaced apart at predetermined intervals along the circumferential direction of the second diffuser, and each downstream end of the plurality of blades is inclined in the circumferential direction with respect to the axial direction. Each extends along

Here, the axial length of the second diffuser is shorter than the axial length of the first diffuser, and the downstream end of two adjacent blades among the plurality of blades of the second diffuser and the upstream side of another adjacent blade. The side ends are spaced apart from each other along the circumferential direction.

According to this configuration, since the plurality of blades of the second diffuser do not overlap, manufacturing can be facilitated.

In one embodiment of the present invention, the length of the blade of the second diffuser is formed shorter than the length of the blade of the first diffuser.

In one embodiment of the present invention, the impeller cover, from the impeller accommodating portion in which the impeller is accommodated, the suction portion extending in the axial direction from the upstream end of the impeller accommodating portion and the air sucked in, and the downstream end of the impeller accommodating portion. A first diffuser accommodating portion extending in the axial direction and accommodating the first diffuser is provided.

Accordingly, an air flow path communicating with each other is formed between the inside of the impeller cover and the impeller, and between the impeller cover and the first diffuser.

Here, the impeller accommodating part is formed in a conical shape corresponding to the shape of the impeller, and the suction part and the first diffuser accommodating part are formed in a cylindrical shape.

In one embodiment of the present invention, the outer end of the blade of the first diffuser along the radial direction is formed to face the inner circumferential surface of the first diffuser accommodating portion.

In one embodiment of the present invention, the outer end along the radial direction of the blade of the first diffuser is formed to come into contact with the inner circumferential surface of the first diffuser accommodating portion.

Accordingly, flow loss of air moving between the plurality of blades of the first diffuser and the impeller cover by the impeller may be suppressed.

In one embodiment of the present invention, the hub of the first diffuser is provided with a through portion penetrating along an axial direction, and the hub of the second diffuser is provided with a protruding portion that protrudes along an axial direction and is inserted into the through portion.

Accordingly, the hub of the first diffuser and the hub of the second diffuser overlap in the axial direction, thereby reducing the length of the diffuser in the axial direction.

In one embodiment of the present invention, an anti-rotation protrusion protruding along an axial direction is formed on one of the mutual contact surfaces of the hub of the first diffuser and the hub of the second diffuser, and the other one of the mutual contact surfaces is formed with the rotation. An anti-rotation protrusion accommodating groove in which the anti-rotation protrusion is accommodated is provided.

Accordingly, the first diffuser and the second diffuser can be assembled in an accurate position.

In addition, the occurrence of play in the circumferential direction of the first diffuser and the second diffuser may be suppressed.

In one embodiment of the present invention, the rear surface of the protruding portion of the second diffuser is provided with a bearing accommodating portion in which a bearing is accommodated.

In one embodiment of the present invention, the communication part is formed between the blades of the first diffuser and the blades of the second diffuser along the axial direction.

Specifically, the hub of the second diffuser is configured to protrude from the hub of the first diffuser along the axial direction, and the plurality of blades of the first diffuser and the plurality of blades of the second diffuser are preset along the axial direction. The length is configured to be spaced apart.

Here, the communication part is formed through the lower side of the downstream end of the hub of the first diffuser.

The communicating part is formed downstream of the plurality of blades of the first diffuser.

The communication part is formed upstream of the plurality of blades of the second diffuser.

Thereby, it can be suppressed that the suction power (suction efficiency) of the impeller is inhibited due to the formation of the communication portion.

In one embodiment of the present invention, the communication unit is implemented in a plurality spaced apart along the circumferential direction of the diffuser.

Specifically, the communication unit is implemented with 2 to 15 pieces.

In one embodiment of the present invention, the hub of the second diffuser includes a cylindrical portion and a disk portion formed to block one end of the cylindrical portion.

The disk part is provided at an upstream end of the cylindrical part based on the moving direction of the air moved by the impeller.

In one embodiment of the present invention, one side of the communication portion is open to the inside of the disk of the second diffuser and the other side is a radial section extending outwardly of the cylindrical portion along the radial direction of the disk and one side of the radial section It communicates with and is configured to have an axial section extending along the other side of the axial direction.

This makes it easy to take out air from the center of the upstream end of the motor.

Here, the axial section of the communication part may be configured to have a first axial section that communicates with the radial section and is recessed in the outer surface of the second diffuser.

The axial section of the communication unit may include a second axial section that communicates with the radial section and is recessed into the inner surface of the hub of the first diffuser.

In one embodiment of the present invention, the axial section is recessed in the outer surface of the second diffuser and communicates with the first axial section communicating with the first axial section and the radial section, and the first diffuser It may be configured with a second axial direction recessed into the inner surface of the hub.

Here, the first axial section and the second axial section may be configured to form a flow path through which air moves in a mutually cooperative manner.

Accordingly, an increase in the thickness of the hub of the first diffuser and/or the hub of the second diffuser due to the formation of the axial section may be suppressed.

In one embodiment of the present invention, the second diffuser is provided with a bracket coupling portion to which the bracket is coupled.

Here, the bracket is configured to include a bearing accommodating portion in which a bearing is accommodated, and a plurality of leg portions, one end of which is connected to the bearing accommodating portion and the other end is bent and disposed along the axial direction.

A bearing disposed on a downstream side of the rotor based on a moving direction of the air moved by the impeller is accommodated in the bearing accommodating portion of the bracket.

The plurality of leg portions of the bracket are configured to come into contact with ends of the stator coupling portion of the second diffuser, respectively.

The plurality of leg parts may be integrally coupled by the stator coupling part and the fastening member.

The stator coupling portion is provided with a fastening member coupling portion to which the fastening member is screwed.

Each of the plurality of leg portions is formed to pass through the fastening member insertion portion along the axial direction so that the fastening member can be inserted.

As described above, according to one embodiment of the present invention, the impeller, the first diffuser, the second diffuser, the impeller cover, and the motor are coupled along the axial direction, and the second diffuser has a hub, an outer wall, and one side of the Having a plurality of blades connected to the circumference of the hub and the other side connected to the outer wall, the impeller cover coupled to the outer wall of the second diffuser, and having a communication part communicating with the inside and outside of the hub of the second diffuser, Air inside the second diffuser may be discharged to the outside while suppressing a decrease in intake efficiency of the impeller. Accordingly, cooling of the motor may be accelerated.

In addition, the first diffuser is accommodated inside the impeller cover and is configured to include a hub and a plurality of blades formed around the hub, so that the use of an outer wall can be eliminated, making it easy to manufacture the first diffuser. can be done

In addition, since the bearing accommodating part is provided in the hub of the second diffuser, vibration and/or displacement of the bearing can be suppressed.

In addition, since the second diffuser is formed of a member having better thermal conductivity than the first diffuser, cooling of the bearing may be accelerated.

In addition, since the second diffuser is provided with a radiating fin, cooling of the bearing provided inside the bearing accommodating part can be further accelerated.

In addition, since a radial radiating fin connected in a radial direction around the bearing accommodating part of the second diffuser is provided, vibration of the bearing accommodating part can be suppressed and cooling of the bearing provided in the bearing accommodating part can be promoted. there is.

In addition, since a circumferential heat dissipation fin disposed in a circumferential direction is provided at the hub of the second diffuser, cooling of the bearing may be further accelerated.

In addition, the hub of the second diffuser is provided with a stator coupling portion coupled to the stator, so that the second diffuser and the stator can be concentrically coupled.

In addition, since the stator coupling part is composed of a plurality of parts and an outer circumferential surface contact part is provided on the inner surface to make surface contact with the outer circumferential surface of the stator, the coupling force between the second diffuser and the stator can be further improved.

In addition, since the stator coupling portion is provided with an end surface contact portion that makes surface contact with the end portion of the stator along the axial direction, the occurrence of relative clearance along the axial direction can be suppressed.

In addition, since the end face contact portion is formed on the outer circumferential contact portion to protrude along the radial direction, the hub of the second diffuser and the end portion of the stator may be spaced apart from each other along the axial direction. Accordingly, since the bearing accommodating part of the second diffuser and the stator are spaced apart from each other in the axial direction, an increase in temperature may be suppressed.

In addition, since the first diffuser and the second diffuser are coupled by a fastening member, bonding force may be improved.

In addition, since the plurality of blades of the second diffuser are configured such that the upstream and downstream ends of two blades adjacent to each other along the circumferential direction are spaced apart along the circumferential direction, manufacturing can be facilitated.

In addition, since the communication part is formed between the blades of the first diffuser and the blades of the second diffuser along the axial direction, it is possible to prevent the suction efficiency of the impeller from being impaired due to the formation of the communication part.

In addition, the communication part has a radial section formed in the radial direction of the disk portion of the hub of the second diffuser and an axial section formed along the axial direction of the hub, so that the air in the central area of the motor (stator) discharge can be facilitated.

In addition, the axial section includes a first axial section recessed on the outer surface of the hub of the second diffuser and a second axial section formed on the inner surface of the hub of the first diffuser, It is possible to suppress an increase in the thickness of the hub of the first diffuser and the hub of the second diffuser due to the formation of.

1 is a perspective view of a motor assembly according to an embodiment of the present invention;
Figure 2 is a cross-sectional view of the motor assembly of Figure 1;
3 is an exploded perspective view of the motor assembly of FIG. 1;
4 is a perspective view of the first diffuser of FIG. 3;
5 is a side view of the second diffuser of FIG. 3;
6 is a cross-sectional view of the second diffuser of FIG. 5;
7 is a bottom view of the second diffuser of FIG. 5;
8 is a bottom perspective view of the second diffuser of FIG. 5;
9 is a view in which the outer wall of the second diffuser of FIG. 5 is removed;
10 is an enlarged view of the communication unit area of FIG. 2;
11 is a cross-sectional view of a communication area of the second diffuser of FIG. 9;
12 is a cross-sectional view of a communication part region of a second diffuser of a motor assembly according to another embodiment of the present invention;
13 is a cross-sectional view of a communication part region of a second diffuser of a motor assembly according to another embodiment of the present invention;
15 to 19 are modified examples of the heat dissipation fin of FIG. 14, respectively;
20 is a cross-sectional view of a motor assembly according to another embodiment of the present invention;
Fig. 21 is an enlarged view of a main part of Fig. 20;

Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings. In this specification, the same or similar reference numerals are given to the same or similar components even in different embodiments, and the description is replaced with the first description. Singular expressions used herein include plural expressions unless the context clearly dictates otherwise. In addition, in describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiment disclosed in this specification, the detailed description thereof will be omitted. In addition, it should be noted that the accompanying drawings are only for easy understanding of the embodiments disclosed in this specification, and should not be construed as limiting the technical idea disclosed in this specification by the accompanying drawings.

1 is a perspective view of a motor assembly according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the motor assembly of FIG. 1, and FIG. 3 is an exploded perspective view of the motor assembly of FIG. 1 to 3, the motor assembly 100 according to an embodiment of the present invention includes an impeller cover 110, an impeller 130, a first diffuser 160, and a second diffuser 190. and a motor 250.

The impeller cover 110, the impeller 130, the first diffuser 160, the second diffuser 190, and the motor 250 are coupled along an axial direction.

In this embodiment, the axial direction means a direction parallel to the rotating shaft 291 of the motor 250 . 1 and 2, the axial direction coincides with the vertical direction.

Specifically, the first diffuser 160 is coupled to one side (lower side in the drawing) of the impeller 130 along the axial direction, and the first diffuser 160 is coupled to one side (lower side in the drawing) of the first diffuser 160. 2 diffusers 190 are coupled.

Here, an air flow path Pa is formed between the impeller cover 110 , the first diffuser 160 and the second diffuser 190 to move air introduced by rotation of the impeller 130 .

A motor 250 is coupled to one side (lower side in the drawing) of the second diffuser 190 along the axial direction.

The impeller 130 and the first diffuser 160 are accommodated inside the impeller cover 110 .

The impeller cover 110 is coupled to the second diffuser 190 .

When the impeller 130 rotates, air is sucked into the impeller cover 110 and moved via the first diffuser 160 and the second diffuser 190 . The air passing through the second diffuser 190 moves radially outwardly of the motor 250 along the axial direction.

The impeller 130 includes a hub 131 and a plurality of blades 133 disposed around the hub 131 in a circumferential direction.

The impeller 130 may be configured to rotate counterclockwise, for example, based on FIG. 1 .

The hub 131 of the impeller 130 has, for example, a conical cross section.

A rotation shaft hole 132 is provided at the center of the hub 131 of the impeller 130 to allow the rotation shaft 291 of the motor 250 to be inserted.

The impeller cover 110 is coupled to the outside of the impeller 130 .

The impeller 130 is rotatably accommodated inside the impeller cover 110 .

When the impeller 130 rotates, air is sucked in from the front (upper side in the drawing) of the impeller cover 110 and discharged to the rear (lower side in the drawing).

The front (upper side in the drawing) of the impeller cover 110 in which air is sucked based on the moving direction of the air moved when the impeller 130 rotates is referred to as an 'upstream side', and the impeller from which the air is discharged The rear (lower side) of the cover 110 may be referred to as a 'downstream side'.

A suction port 112 through which air is sucked is formed through the center of the impeller cover 110 .

The impeller cover 110 includes an impeller accommodating portion 113 accommodating the impeller 130 and a first diffuser accommodating portion 114 accommodating the first diffuser 160 .

The impeller accommodating part 113 is implemented in a conical shape corresponding to the shape of the impeller 130 .

The impeller cover 110 includes a suction part 111 through which air is sucked.

The suction part 111 may be formed to extend along the axial direction from an upstream end of the impeller accommodating part 113 .

The suction hole 112 is formed to pass through the inside of the suction part 111 along the axial direction.

The inner surface of the suction part 111 may be implemented in a cross-sectional shape of a circular arc with a center convex inward, for example.

The first diffuser accommodating part 114 is configured to extend from the downstream end of the impeller accommodating part 113 along the axial direction.

The suction part 111 is implemented in a cylindrical shape having the same outer diameter.

The impeller accommodating portion 113 is implemented in a conical cross-sectional shape in which an outer diameter is gradually enlarged.

The first diffuser accommodating part 114 is implemented in a cylindrical shape having the same outer diameter.

The impeller cover 110 is coupled to the second diffuser 190 .

Specifically, the downstream end of the impeller cover 110 is coupled to the upstream end of the second diffuser 190 .

An insertion part 115 is provided at the downstream end of the impeller cover 110 to allow the upstream end of the second diffuser 190 to be inserted.

The insertion part 115 is formed by cutting the inner surface of the impeller cover 110 to expand along the radial direction.

An upstream end of the second diffuser 190 contacts the insertion part 115 along the axial direction.

Accordingly, axial movement of the impeller cover 110 and the second diffuser 190 may be suppressed.

The outer periphery of the insertion part 115 is disposed outside the outer wall 197 of the second diffuser 190 in the radial direction, which will be described later.

The first diffuser 160 is disposed on one side (lower side, downstream side in the drawing) of the impeller 130 along the axial direction.

The first diffuser 160 is spaced apart by a preset width along the axial direction so that the impeller 130 can be rotated.

The second diffuser 190 is coupled to one side (lower side in the drawing) of the first diffuser 160 .

The first diffuser 160 includes a hub 161 and a plurality of blades 171 disposed around the hub 161 in a circumferential direction.

The first diffuser 160 is installed inside the impeller cover 110 so that the outer ends of the plurality of blades 171 face the inner circumferential surface of the first diffuser accommodating part 114 .

In this embodiment, the outer ends of the plurality of blades 171 of the first diffuser 160 are configured to come into contact with the inner circumferential surface of the first diffuser accommodating part 114 .

Accordingly, flow loss of air sucked into the impeller cover 110 by rotation of the impeller 130 may be suppressed.

The second diffuser 190 includes a hub 191, an outer wall 197 concentrically disposed around the hub 191, one end connected to the hub 191, and the other end connected to the outer wall 197. ) and a plurality of blades 198 connected to it.

The outer wall 197 is provided outside the downstream end of the hub 191 of the second diffuser 190 .

Specifically, the outer wall 197 is concentrically disposed at a preset distance from the outer circumference of the downstream end of the hub 191 of the second diffuser 190 .

In the second diffuser 190, a region (an upper region in the drawing) is inserted and coupled to the inside of the first diffuser 160.

The other area (lower area in the drawing) of the second diffuser 190 protrudes to the outside of the first diffuser 160 .

Specifically, the hub 191 of the second diffuser 190 is inserted into and coupled to the hub 161 of the first diffuser 160 .

The outer wall 197 of the second diffuser 190 is exposed to the outside of the first diffuser 160 .

The impeller cover 110 is coupled to the outer wall 197 of the second diffuser 190 .

The upstream end of the outer wall 197 of the second diffuser 190 contacts the end of the insertion part 115 of the impeller cover 110 along the axial direction.

In the motor 250, one area (an upper area in the drawing) is inserted into the second diffuser 190 along the axial direction.

The motor 250 includes a stator 260 and a rotor 290 rotatable with respect to the stator 260 .

The stator 260 includes, for example, a stator core 261 and a stator coil 271 wound around the stator core 261 .

Inside the stator core 261, a rotor accommodating hole 263 in which the rotor 290 is rotatably accommodated with a predetermined air gap (G) is formed.

The rotor receiving hole 263 is formed to penetrate along the axial direction.

A plurality of teeth 264 and slots 265 are alternately formed around the rotor accommodating hole 263 along the circumferential direction.

The stator core 261 is formed by insulating and stacking a plurality of electrical steel plates 262 each having the rotor accommodating hole 263, a plurality of slots 265, and teeth 264, respectively.

An insulator 281 for insulating the stator coil 271 is provided in the stator core 261 . The insulator 281 may be configured to be coupled to contact with each other at both sides of the stator core 261 along the axial direction, for example.

The rotor 290 includes, for example, a rotating shaft 291 and a permanent magnet 292 rotating around the rotating shaft 291 .

The permanent magnet 292 is implemented in a cylindrical shape.

A rotation shaft hole 293 is formed through the center of the permanent magnet 292 so that the rotation shaft 291 can be inserted therein.

The rotating shaft 291 is rotatably supported by a bearing 310 .

The bearing 310 may be disposed on both sides of the permanent magnet 292 along the axial direction.

The bearing 310 may be implemented as, for example, a ball bearing.

Specifically, the bearing 310 includes an outer race, an inner race concentrically disposed inside the outer race, and a plurality of balls disposed between the outer race and the inner race.

The bearing 310 includes, for example, a first bearing 310a provided between the impeller 130 and the rotor 290 and a second bearing 310a spaced apart from the first bearing 310a along an axial direction. A bearing 310b is provided.

In this embodiment, the first bearing 310a has a larger size than the second bearing 310b. Specifically, the outer race 311, the inner race 312, and the ball 313 of the first bearing 310a are compared to the outer race 311, the inner race 312, and the ball 313 of the second bearing 310b. Each consists of a large

Accordingly, the impeller 130 and the rotor 290 can be stably supported.

A bracket 330 is coupled to one side (lower side in the drawing) of the stator 260.

The bracket 330, for example, includes a bearing accommodating portion 331 in which the bearing 310 is accommodated, and one end thereof connected to the bearing accommodating portion 331 and the other end bent and arranged in the axial direction. A leg portion 332 is provided.

In this embodiment, the second bearing 310b is accommodated and coupled to the bearing accommodating portion 331 of the bracket 330.

The plurality of leg parts 332, for example, are implemented as three.

The plurality of leg portions 332 are, for example, a radial section 3321 extending along a radial direction from the bearing receiving portion 331 and bent from the radial section 3321 to extend in an axial direction. It has an axial section 3322.

An inclined portion 3323 cut obliquely with respect to the axial direction is provided in the outer boundary area of the radial section 3321 and the axial section 3322.

A fastening member insertion part 333 is formed through the axial section 3322 so that the fastening member 335 coupled to the second diffuser 190 can be inserted. Here, the fastening member 335 may be screwed to the second diffuser 190 .

Meanwhile, the stator coil 271 is connected to the PCB 350 (Printed Circuit Board (PCB)).

The stator coil 271 may be configured to be connected to, for example, a three-phase AC power supply.

The stator coil 271 may include a plurality of phase coils connected to phase power sources (U phase, V phase, W phase) of the AC power supply.

In this embodiment, in the motor assembly 100, for example, the outer diameter of the impeller cover 110 is about 55 mm, the outer diameter of the stator 260 is about 40 mm, and the outer diameter of the rotor 290 is about 40 mm. It can be implemented as a (ultra)miniature motor assembly of about 9mm.

Accordingly, the size and weight of the motor assembly 100 can be reduced, and when the motor assembly 100 of the present embodiment is installed in a handheld device, installation and handling can be facilitated, respectively.

In this embodiment, the stator 260 and the rotor 290 are implemented to enable (ultra) high-speed rotation (eg, 100 krpm to 180 krpm).

As a result, despite the reduction in size and weight of the motor assembly 100, relatively high speed rotation is possible, thereby maintaining the same air volume as the motor assembly before the size and weight of the motor assembly was reduced or securing the same or higher wind direction. It can be.

A plurality of connection terminals 283 respectively connected to the plurality of phase coils are provided on one side of the stator 260 . The stator 260 is provided with a plurality of connection terminal support parts 282 supporting the plurality of connection terminals 283 . The connection terminal support part 282 may be provided in the insulator 281 , for example. The plurality of connection terminal support portions 282 are spaced apart from each other in the circumferential direction. The plurality of connection terminal support portions 282 are configured to extend to one side (lower side in the drawing) along the axial direction. The plurality of connection terminal support parts 282 are formed so that the plurality of connection terminals 283 are respectively disposed on the downstream side of the bracket 330 along the axial direction. The plurality of connection terminals 283 may be respectively disposed between the plurality of leg parts 332 of the bracket 330, for example.

The PCB 350 is provided on one side (lower side in the drawing) of the bracket 330 along the axial direction.

The PCB 350 includes, for example, a substrate 351 and a circuit component 352 mounted on the substrate 351 . An inverter circuit capable of providing three-phase AC power to the stator coil 271 may be provided on the substrate 351 , for example.

The substrate 351 may be implemented in a disk shape, for example.

The substrate 351 is provided with a plurality of connection terminal insertion portions 3511 into which the plurality of connection terminals 283 are respectively inserted and coupled. Each of the plurality of connection terminal insertion portions 3511 is formed through the substrate 351 .

Joints 3512 capable of electrically connecting the plurality of connection terminals 283 are provided in each of the plurality of connection terminal insertion parts 3511 . The joint portion 3512 may be formed by soldering the connection terminal 283 and the connection terminal insertion portion 3511, for example.

4 is a perspective view of the first diffuser of FIG. 3 . As shown in FIG. 4 , the first diffuser 160 includes a hub 161 and a plurality of blades 171 .

The first diffuser 160 is formed of, for example, a synthetic resin member.

Accordingly, the weight of the first diffuser 160 can be reduced.

The hub 161 of the first diffuser 160 has a cylindrical shape with a downward opening.

Specifically, the hub 161 of the first diffuser 160 may have an upstream end blocked and a downstream end open based on the moving direction of the air moved by the impeller 130 .

The hub 161 of the first diffuser 160 includes a cylindrical portion 1611 and a disk portion 1612 formed to block one end of the cylindrical portion 1611 along an axial direction.

In this embodiment, the disk part 1612 of the first diffuser 160 is disposed at an upstream end of the cylindrical part 1611 .

A penetrating portion 162 is formed at the center of the hub 161 (disk portion 1612) of the first diffuser 160 to allow the protruding portion 2001 of the second diffuser 190 to be inserted.

The first diffuser 160 may be coupled to the second diffuser 190 by a fastening member 165 .

Accordingly, the bonding force between the first diffuser 160 and the second diffuser 190 may be improved.

A fastening member insertion hole 163 is formed through the hub 161 of the first diffuser 160 so that the fastening member 165 can be inserted.

The fastening member insertion hole 163 is composed of a plurality of spaced apart from each other along the circumferential direction around the through portion 162 .

A plurality of blades 171 are provided on the outer surface of the hub 161 of the first diffuser 160 .

The plurality of blades 171 are spaced apart from each other along the circumferential direction.

The plurality of blades 171, for example, are each disposed inclined with respect to the axial direction.

Specifically, the plurality of blades 171 are each implemented in a curved cross-sectional shape with a center convex to the upstream side.

Each of the plurality of blades 171 is configured such that a downstream end is disposed forward compared to an upstream end based on the rotational direction of the impeller 130 .

The plurality of blades 171 of the first diffuser 160 are configured so that the upstream end 1711 and the downstream end 1712 of two adjacent blades 171 overlap each other along the axial direction.

Based on the rotational direction of the impeller 130, the downstream end 1712 of the rear blade 171 is disposed forward and lower than the upstream end 1711 of the front blade 171. That is, the two blades adjacent to each other of the first diffuser 160 are arranged so that approximately half of the length of the blade overlaps each other in the axial direction.

5 is a side view of the second diffuser of FIG. 3, FIG. 6 is a cross-sectional view of the second diffuser of FIG. 5, FIG. 7 is a bottom view of the second diffuser of FIG. 5, and FIG. 8 is a view of the second diffuser of FIG. It is a bottom perspective view, and FIG. 9 is a view in which the outer wall of the second diffuser of FIG. 5 is removed. As shown in FIGS. 5 to 9 , the second diffuser 190 includes a hub 191 , an outer wall 197 and a plurality of blades 198 .

The hub of the second diffuser 190 has a tubular shape with one side (lower side in the drawing) opened.

The hub 191 of the second diffuser 190 is implemented in a cylindrical shape with a downward opening.

The hub 191 of the second diffuser 190 includes, for example, a cylindrical portion 192 and a disk portion 193 formed to block one end of the cylindrical portion 192 along an axial direction. .

The hub 191 of the second diffuser 190 is configured to be inserted into the hub 161 of the first diffuser 160 .

The outer surface of the hub 191 of the second diffuser 190 is configured to be in surface contact with the inner surface of the hub 161 of the first diffuser 160 .

Specifically, the cylindrical portion 192 of the hub 191 of the second diffuser 190 is coupled to the inner surface of the cylindrical portion 1611 of the hub 161 of the first diffuser 160 in surface contact.

The disk part 193 of the hub 191 of the second diffuser 190 is coupled to the inner surface of the cylindrical part 1611 of the hub 161 of the first diffuser 160 in surface contact.

The hub 191 of the second diffuser 190 is configured to protrude to one side (lower side in the drawing) along the axial direction when coupled with the first diffuser 160 .

In this embodiment, one of the mutual contact surfaces of the second diffuser 190 and the first diffuser 160 is provided with an anti-rotation protrusion 2006 protruding in the axial direction, and the other anti-rotation protrusion ( 2006) is provided with an anti-rotation protrusion receiving groove 166.

The anti-rotation protrusion 2006 may be formed on the second diffuser 190, for example.

The anti-rotation protrusion 2006 is provided on a radially outer side of the protrusion 2001 .

Specifically, the anti-rotation protrusion 2006 is formed to protrude from the outer surface of the second diffuser 190 .

The anti-rotation protrusion accommodating groove 166 may be formed in the first diffuser 160 .

The anti-rotation protrusion accommodating groove 166 is formed to be recessed along the axial direction on the inner surface of the first diffuser 160, for example.

The anti-rotation protrusion accommodating groove 166 is provided on the outer side of the through portion 162 in the radial direction.

The hub 191 of the second diffuser 190 is disposed outside the first section 1921 inserted into the hub 161 of the first diffuser 160 and the first diffuser 160. A second section 1922 is provided.

Here, the second section 1922 is configured to further protrude outward from the outer circumference of the first section 1921 along the radial direction.

The outer diameter of the second section 1922 is larger than that of the first section 1921 .

The outer diameter of the second section 1922 may be configured to have the same size as the outer diameter of the hub 161 of the first diffuser 160, for example.

When the first diffuser 160 and the second diffuser 190 are coupled, the lower end of the first diffuser 160 may be in surface contact with the upper end of the second section 1922 .

A bearing accommodating part 2003 is provided at the center of the hub 191 of the second diffuser 190 .

The bearing accommodating part 2003 of the second diffuser 190 is formed on the rear surface of the protruding part 2001 .

The bearing accommodating part 2003 of the second diffuser is formed to protrude from the inner center of the hub 191 of the second diffuser 190 along the axial direction.

The bearing accommodating part 2003 is formed on the disk part 193 of the hub 191 of the second diffuser 190.

An accommodating space 2004 in which the bearing 310 (first bearing 310a) is accommodated is formed inside the bearing accommodating part 2003 .

The second diffuser 190 is formed of a member having better thermal conductivity than the first diffuser 160 .

Accordingly, cooling of the bearing 310 (first bearing 310a) accommodated in the bearing accommodating portion 2003 may be accelerated.

The second diffuser 190 is formed of a metal member.

Accordingly, heat dissipation of the second diffuser 190 may be accelerated.

Also, the rigidity of the second diffuser 190 may be improved.

The second diffuser 190 is formed of, for example, an aluminum (Al) member.

The protrusion 2001 is provided with a through hole 2002 through which the rotating shaft 291 can pass.

The protruding part 2001 is inserted into and coupled to the through part 162 of the first diffuser 160 along the axial direction.

Accordingly, since the first diffuser 160 and the second diffuser 190 overlap along the axial direction, the length in the axial direction may be shortened.

In addition, the occurrence of lateral play between the first diffuser 160 and the second diffuser 190 may be suppressed.

The second diffuser 190 includes a stator coupling part 195 coupled to the stator 260 .

The stator coupling part 195 is provided inside the second diffuser 190 .

The stator coupling part 195 is composed of a plurality of spaced apart along the circumferential direction of the second diffuser 190 .

In this embodiment, the stator coupling part 195 is implemented as three.

The stator coupling part 195 is formed to protrude from the inner surface of the hub 191 of the second diffuser 190, for example.

The stator coupling part 195 has one end connected to the outer surface of the bearing accommodating part 2003 and the other end having a radial section 1951 extending along the radial direction.

The stator coupling part 195 includes an axial section 1952 extending along an axial direction from the radial section 1951.

The axial section 1952 protrudes along the radial direction from the inner circumferential surface of the hub 191 of the second diffuser 190 and is configured to be disposed along the axial direction.

The radial section 1951 protrudes along the axial direction from the inner surface of the second diffuser 190 .

The radial section 1951 has, for example, the same height Hr as the bearing accommodating portion 2003 .

The stator coupling part 195 has an outer circumferential surface contact part 1953 that comes into surface contact with the outer circumferential surface of the stator 260 (stator core 261).

Each of the outer circumferential contact portions 1953 is configured to have a radius of curvature corresponding to the outer diameter of the stator core 261, for example.

Accordingly, the second diffuser 190 and the stator 260 (stator core 261) may be coupled concentrically.

The bearing accommodating part 2003 of the second diffuser 190 is implemented in a downwardly opened cylindrical shape.

The bearing accommodating part 2003 of the second diffuser 190 is provided with the through hole 2002 through which the rotating shaft 291 can pass.

The second diffuser 190 is provided with a fastening member recombination part 1956 communicating with the fastening member insertion hole 163 provided in the first diffuser 160 . The fastening member recombination part 1956 provided in the hub 191 of the second diffuser 190 is, for example, the fastening member 165 passing through the fastening member insertion hole 163 of the first diffuser 160. ) may be configured to be screwed.

The fastening member coupling portion 1956 of the second diffuser 190 may be formed through, for example, each radial section 1951 of the stator coupling portion 195 .

The stator coupling part 195 is provided with an end surface contact part 1954 which is in surface contact with one end (upper part in the drawing) of the stator 260 along the axial direction.

Accordingly, occurrence of axial play between the second diffuser 190 and the stator 260 may be suppressed.

The end surface contact portion 1954 is provided in an axial section 1952 of the stator coupling portion 195.

According to this configuration, the stator 260 and the bearing 310 (first bearing 310a) may be spaced apart from each other by a predetermined distance along the axial direction.

Accordingly, an increase in the temperature of the bearing 310 provided in the second diffuser 190 due to thermal energy generated by the stator 260 can be suppressed.

The end surface contact portion 1954 is spaced apart from the lower end of the cylindrical portion 192 of the hub 191 of the second diffuser 190 along the axial direction.

The end surface contact portion 1954 is spaced apart from the disk portion 193 of the hub 191 along the axial direction.

As shown in FIG. 9 , the axial section 1952 is configured to protrude from the hub 191 of the second diffuser 190 along the axial direction.

Specifically, the stator coupling part 195 is configured to protrude downward from the lower end of the hub 191 of the second diffuser 190 (the downstream end of the hub 191).

Fastening member coupling portions 1955 are provided in the stator coupling portion 195 (axial section 1952) so that the coupling members 335 coupled to the bracket 330 can be screwed together.

The fastening member coupling portions 1955 of the stator coupling portion 195 are each formed at a predetermined depth from the downstream end of the axial section 1952 along the axial direction.

The plurality of blades 198 of the second diffuser 190 are shorter than the plurality of blades 171 of the first diffuser 160 .

As shown in FIG. 9, the plurality of blades 198 of the second diffuser 190 are configured to be spaced apart from each other along the circumferential direction at predetermined intervals. .

Specifically, among the two blades 198 adjacent to each other, the downstream end of the blade disposed rearward relative to the upstream end of the blade 198 disposed forward relative to the rotational direction of the impeller 130 moves backward. Each is configured to be spaced apart from each other.

According to this configuration, manufacturing of the second diffuser 190 can be facilitated.

Meanwhile, referring to FIGS. 6 and 9 together, the hub 191 of the second diffuser 190 is provided with a communication part 205 communicating the inside and outside.

Accordingly, the air inside the second diffuser 190 may be discharged to the outside of the second diffuser 190 .

According to this configuration, the air inside the second diffuser 190, the temperature of which is increased by the thermal energy generated during operation of the motor 250 (the stator 260 and the rotor 290), is transferred to the communication unit 205 ) is discharged to the outside of the second diffuser 190, the temperature inside the second diffuser 190 can be reduced.

Accordingly, since the temperature rise of the stator 260 and the rotor 290 is suppressed, when the temperature of the stator 260 and the rotor 290 rises, the electrical resistance of the stator 260 and the rotor 280 increases. Due to this, a phenomenon in which the output of the motor 250 is inhibited can be suppressed. That is, since the stator 260 and the rotor 290 of this embodiment are operated at a relatively low temperature by the air discharge action of the communication unit 205, the output of the motor 250 can be increased.

The communication part 205 may be implemented in a plurality spaced apart along the circumferential direction of the second diffuser 190 .

The number of communication units 205 may be implemented with, for example, 2 to 15 units.

In this embodiment, the communication unit 205 is exemplified in the case of implementing nine, but this is only an example, and is not limited thereto.

The communication part 205 is formed on the upstream side of the plurality of blades 198 of the second diffuser 190, respectively.

10 is an enlarged view of the communication part area of FIG. 2, FIG. 11 is a cross-sectional view of the communication part area of FIG. 9, and FIG. 12 is a cross-sectional view of the communication part area of the second diffuser of the motor assembly according to another embodiment of the present invention. 13 is a cross-sectional view of a communication part region of a second diffuser of a motor assembly according to another embodiment of the present invention.

As shown in FIGS. 10 and 11 , the communication portion 205 is formed by penetrating the cylindrical portion 192 of the hub 191 of the second diffuser 190 along the radial direction.

The communication unit 205 may be implemented in a long hole shape having a length substantially greater than its width, for example.

The communication part 205 has a length along the circumferential direction of the cylindrical part 192 of the hub 191 of the second diffuser 190, and a width of the cylindrical part 192 of the hub 191. It can be configured to be disposed in the axial direction.

The communication part 205 is disposed on one side (lower side in the drawing) of the first diffuser 160 along the axial direction.

The communication part 205 is disposed on one side (lower side) of the plurality of blades 171 of the first diffuser 160 along the axial direction.

Referring back to FIG. 9 , the communication part 205 is formed in the second section 1922 of the cylindrical part 192 of the second diffuser 190 .

Each communication part 205 is formed so that its upstream side (upper side) is opened along the axial direction.

When the first diffuser 160 and the second diffuser 190 are coupled, the open area on the upstream side of the communication part 205 is blocked by the downstream end (lower end) of the first diffuser 160, respectively. .

In this embodiment, as described above, the communication unit 205 may be implemented as nine.

Specifically, three of the communication portions 205 may be formed through, for example, the stator coupling portion 195 (axial section 1952).

Six of the communication parts 205 may be formed by penetrating the cylindrical part (second section 1922) of the hub 191 of the second diffuser 190, respectively.

On the other hand, as shown in FIG. 12 , the second diffuser 190 may be configured with six communicating parts 205a.

In this embodiment, three of the six communication portions 205a may be formed by radially penetrating the stator coupling portion 195 (axial section 1952).

Three of the six communication parts 205 extend the hub 191 (second section 1922) of the second diffuser 190 in a radial direction so as to be disposed between the stator coupling part 195, respectively. can be formed through

Also, as shown in FIG. 13 , the second diffuser 190 may include 12 communication units 205b.

Three of the 12 communication parts 205b may be formed through the stator coupling part 195 .

Nine of the 12 communication parts 205b may be configured to be disposed three by three between the stator coupling parts 195.

With this configuration, when the impeller cover 110, the impeller 130, the first diffuser 160, the second diffuser 190, and the motor 250 are combined, the first diffuser 160 The second diffuser 190 is inserted into and coupled to the inside, and the bearing 310 (first bearing 310a) is accommodated and coupled to the bearing accommodating part 2003 of the second diffuser 190.

The stator 260 may be inserted and coupled to the second diffuser 190 along an axial direction, and the rotor 290 may be inserted and coupled into the stator 260 .

The upper end of the rotary shaft 291 of the rotor 290 is coupled to pass through the first bearing 310a, and the impeller 130 is coupled to the upper end of the rotary shaft 291.

The impeller cover 110 is coupled to the outer wall 197 of the second diffuser 190 .

The bearing 310 (second bearing 310b) is coupled to the lower region of the rotating shaft 291 of the rotor 290, and the second bearing 310b is the bearing receiving portion 331 of the bracket 330. ) is inserted into.

The plurality of leg parts 332 of the bracket 330 are fixedly coupled to the stator coupling part 195 by fastening members 335, respectively.

Between the plurality of leg portions 332 of the bracket 330, the connection terminal support portions 282 of the stator 260 are disposed, respectively, and the connection terminals protrude downward from the bracket 330 along the axial direction. The PCB 350 is electrically coupled to 283. Accordingly, three-phase AC power may be applied to the stator coil 271 .

Meanwhile, when operation starts and power is applied to the stator coil 271, the stator coil 271 generates magnetic force, and the rotor 290 generates magnetic force of the permanent magnet 292 and the stator coil 271. is rotated about the rotation axis 291 by the interaction of the magnetic force of.

When the impeller 130 is rotated by the rotation of the rotor 290 , air is sucked into the impeller cover 110 through the inlet 112 .

The air sucked into the impeller cover 110 is guided by the plurality of blades 171 of the first diffuser 160 and the plurality of blades 198 of the second diffuser 190 along the axial direction. It is discharged to the downstream side of the second diffuser 190. The discharged air is moved downward along the axial direction from the outside of the stator 260 in the radial direction.

Meanwhile, when the operation starts and the impeller 130 rotates, the speed of the air on the downstream side of the impeller 130 increases and the pressure decreases. At this time, since the outer air passage Pa of the second diffuser 190 has a relatively low pressure along the radial direction, the air inside the hub 191 of the second diffuser 190 flows through the communication portion ( 205) to the outside of the hub 191 of the second diffuser 190.

When the impeller 130 rotates, air inside the hub 191 of the second diffuser 190 is continuously discharged through the communication part 205, so that the motor 250 (stator 260 and rotor) Air is continuously moved toward the communication part 205 via the upper region of 290). Accordingly, the motor 250 (the stator 260 and the rotor 290 ) can be continuously cooled by the air continuously moving toward the communication part 205 . As a result, the stator 260 and the rotor 290 can maintain relatively low temperatures, and an increase in electrical resistance due to a temperature rise is suppressed, so that the output of the motor 250 can be improved.

14 is a bottom perspective view of the second diffuser of the motor assembly according to an embodiment of the present invention, and FIGS. 15 to 19 are modified examples of the heat dissipation fin of FIG. 14 .

As shown in FIG. 14, the second diffuser 190a of the motor assembly according to an embodiment of the present invention is concentrically disposed on the outside of the hub 191 and the hub 191, as described above. It is configured with an outer wall 197 and a plurality of blades 198 connected to the hub 191 at one end and connected to the outer wall 197 at the other end.

The hub 191 of the second diffuser 190 is provided with a bearing accommodating part 2003 in which the bearing 310 is accommodated.

The second diffuser 190 includes a stator coupling part 195 coupled to the stator 260 .

The stator coupling part 195 has one end connected to the bearing accommodating part 2003 and a radial section 1951 extending along the radial direction and an axial direction extending from the radial section 1951 in the axial direction. section 1952.

The stator coupling part 195 includes an outer surface contact part 1953 which is in surface contact with the outer circumference of the stator 260 and an end surface contact part 1954 which is in surface contact with one end of the stator 260 along the axial direction. do.

The second diffuser 190 includes a communication part 205 communicating the inside and outside of the hub 191 of the second diffuser 190 .

The second diffuser 190 is formed of a metal member.

The second diffuser 190 is formed of an aluminum (Al) member.

On the other hand, in this embodiment, the second diffuser 190 is provided with a heat dissipation fin 220 protruding to increase the surface area.

The heat dissipation fin 220, for example, has one end connected to the circumference of the bearing receiving portion 2003 and the other end provided with a radial direction heat dissipation fin 221 extending in a radial direction.

Accordingly, heat dissipation of the bearing accommodating portion 2003 can be promoted.

In addition, the support strength of the bearing accommodating portion 2003 can be improved.

According to this configuration, generation of vibration of the bearing 310 (first bearing 310a) provided inside the bearing accommodating portion 2003 can be suppressed. In addition, cooling of the bearing 310 (first bearing 310a) provided inside the bearing accommodating portion 2003 may be accelerated.

The radial direction heat dissipation fins 221 may be respectively disposed between the stator couplers 195 along the circumferential direction, for example.

In this embodiment, the number of radial heat dissipation fins 221 may be implemented as three.

The radial heat dissipation fin 221 has the same height as the stator coupling part 195 along the axial direction.

In this embodiment, the radiating fin 220 includes a circumferential radiating fin 222 disposed around the bearing accommodating portion 2003 along a circumferential direction.

Accordingly, heat dissipation of the second diffuser 190 may be accelerated.

Also, the rigidity of the second diffuser 190 may be improved.

According to this configuration, generation of vibration of the bearing 310 (first bearing 310a) provided inside the bearing accommodating portion 2003 can be suppressed.

In addition, cooling of the bearing 310 (first bearing 310a) provided inside the bearing accommodating portion 2003 may be accelerated.

The circumferential radiating fins 222 are implemented as a plurality of concentrically arranged around the bearing accommodating part 2003 .

The circumferential heat radiation fins 222 may be formed in the same number as the radial heat radiation fins 221 . In this embodiment, the circumferential heat dissipation fins 222 are implemented as three.

The circumferential heat dissipation fin 222 has, for example, a protruding height Hc axially protruding from the inner surface of the hub 191 in the axial direction of the radial heat dissipation fin 221 from the inner surface of the hub 191. It may be configured smaller than the protruding height (Hr) protruding into.

The radial radiating fins 221 are configured to protrude more than the circumferential radiating fins 222 along the axial direction from the inner surface of the hub 191 .

Here, as shown in FIG. 15, the radiating fin 220a of this embodiment includes a radial radiating fin 221 and a circumferential radiating fin 222 having the same protruding height along the axial direction from the inner surface of the hub 191. can do.

In this embodiment, the radial radiating fin 221 and the circumferential radiating fin 222 may have the same height as, for example, the stator coupling part 195 .

In addition, as shown in FIG. 16, the radiating fin 220b of this embodiment includes a radial radiating fin 221b and a circumferential radiating fin 222b respectively protruding from the inner surface of the hub 191 in the axial direction. . In this embodiment, the protruding height (Hr) protruding along the axial direction from the disk portion 193 of the hub 191 of the radial radiating fin (221b) is the protruding height (Hc) of the circumferential radiating fin (222b). ) is formed in the same way as The protruding height Hr of the radial heat dissipation fin 221b and the protrusion height Hc of the circumferential heat dissipation fin 222b are the stator coupling protruding from the disk portion 193 of the hub 191 along the axial direction. It is configured to have a small protrusion height (Hr, Hc) compared to the protrusion height (Hs) of the portion 195.

Meanwhile, the radiating fins 220 may include radial radiating fins 221 and circumferential radiating fins 222 formed in different numbers.

As shown in FIG. 17 , the heat dissipation fins 220c include three circumferential heat dissipation fins 222c and six radial heat dissipation fins 221c. In this embodiment, the radial heat dissipation fins 221c may be configured by two between the stator coupling parts 195 adjacent to each other along the circumferential direction. The circumferential radiating fins 222c may be disposed between the radial radiating fins 221c along the circumferential direction, respectively.

The circumferential radiating fin 222c is configured to connect the stator coupling portion 195 and the radial radiating fin 221c adjacent to each other along the circumferential direction, or to connect two circumferential radiating fins 222c adjacent to each other.

As shown in FIG. 18 , the heat dissipation fin 220d includes three circumferential heat dissipation fins 222d and nine radial heat dissipation fins 221d. In this embodiment, the radial heat dissipation fins 221d may be configured in threes each between two stator coupling parts 195 adjacent to each other along the circumferential direction. Each of the circumferential radiating fins 222d may be provided between two adjacent radial radiating fins 221d.

Each of the circumferential radiating fins 222d is configured to connect the stator coupler 195 and the radial radiating fin 221d adjacent to each other or connect two circumferential radiating fins 222d adjacent to each other.

On the other hand, as shown in FIG. 19, the radiating fins 220e include two circumferential radiating fins 222d spaced apart along the radial direction around the bearing accommodating portion 2003 and two stator coupling portions 195 adjacent to each other. It is configured with three radial heat dissipation fins 221d respectively disposed therebetween.

Each of the circumferential radiating fins 222d has one end connected to the stator coupling part 195 and the other end connected to the radial radiating fin 221d, respectively.

20 is a cross-sectional view of a motor assembly according to another embodiment of the present invention, and FIG. 21 is an enlarged view of a main part of FIG. 20 . The motor assembly 100a of this embodiment includes an impeller 130, an impeller cover 110, a first diffuser 160, a second diffuser 190b, and a motor 250.

The impeller cover 110, the impeller 130, the first diffuser 160, the second diffuser 190b, and the motor 250 are coupled to each other along an axial direction.

The impeller 130 is accommodated inside the impeller cover 110 , and the first diffuser 160 is coupled to a downstream side of the impeller 130 . The second diffuser 190b is coupled to the first diffuser 160, and the impeller cover 110 accommodates the impeller 130 and the first diffuser 160 inside the second diffuser 190b. ) are combined.

Here, an air flow path Pa is formed between the impeller cover 110, the first diffuser 160, and the second diffuser 190b to move air introduced by rotation of the impeller 130.

The motor 250 is coupled to the second diffuser 190b.

The motor 250 has a stator 260 and a rotor 290 rotatably received with a predetermined air gap (G) with respect to the stator 260 .

The stator 260 includes a stator core 261 and a stator coil 271 wound around the stator core 261 .

The stator 260 includes a plurality of connection terminals 283 electrically connected to the stator coil 271 at one end and extending along an axial direction at the other end.

The plurality of connection terminals 283 are electrically connected to the PCB 350 . The PCB 350 includes a substrate 351 and a plurality of circuit components 352 provided on the substrate 351 . The PCB 350 may include, for example, an inverter circuit to provide three-phase AC power to the stator coil 271 .

The rotor 290 includes a rotating shaft 291 and a permanent magnet 292 rotated about the rotating shaft 291 . The rotating shaft 291 is rotatably supported by a bearing 310 . The bearing 310 includes a first bearing 310a and a second bearing 310b provided on both sides (upper and lower sides in the drawing) of the permanent magnet 292 along the axial direction. The first bearing 310a may have a larger size than the second bearing 310b.

The impeller 130 includes a hub 131 and a plurality of blades 133 provided around the hub 131 .

The first diffuser 160 includes a cylindrical hub 161 and a plurality of blades 171 provided on an outer surface of the hub 161 .

The outer ends along the radial direction of the plurality of blades 171 of the first diffuser 160 are formed to face the inner circumferential surface of the impeller cover 110 . Specifically, outer ends along the radial direction of the plurality of blades 171 of the first diffuser 160 are configured to come into contact with the inner circumferential surface of the impeller cover 110 .

Meanwhile, the second diffuser 190b includes a cylindrical hub 191, an outer wall 197 concentrically disposed outside the hub 191, and one end connected to the hub 191 and the other end A plurality of blades 198 connected to the outer wall 197 are provided.

The hub 191 of the second diffuser 190b is inserted into the hub 161 of the first diffuser 160.

An anti-rotation protrusion 2006 protruding in the axial direction is provided on one of the mutual contact surfaces of the first diffuser 160 and the second diffuser 190b, and the anti-rotation protrusion 2006 is inserted into the other one. An anti-rotation protrusion receiving groove 166 is provided.

The anti-rotation protrusion 2006 is formed to protrude in the axial direction on the outer surface of the second diffuser 190, and the anti-rotation protrusion receiving groove 166 is formed on the inner surface of the first diffuser 160 in the axial direction. formed to be recessed.

The hub 191 of the second diffuser 190b includes a cylindrical portion 192 and a disk portion 193 formed to block one end of the cylindrical portion 192 along an axial direction.

The cylindrical portion 192 of the hub 191 of the second diffuser 190b protrudes from the first section 1921 inserted into the first diffuser 160 and the outside of the first diffuser 160. It includes a second section 1922 to be.

The hub 191 (disk part 193) of the second diffuser 190b is provided with a bearing accommodating part 2003 in which the bearing 310 (first bearing 310a) is accommodated.

A stator coupling part 195 to which the stator 260 is coupled is formed in the second diffuser 190b.

The stator coupling part 195 has one end connected to the bearing accommodating part 2003 and the other end extending radially in the radial section 1951 and the axial direction from the end of the radial section 1951. It is configured to include an axial section 1952 extending along.

A bracket 330 for accommodating and supporting the bearing 310 (second bearing 310b) is provided at one side (lower side in the drawing) of the motor 250 along the axial direction.

The bracket 330 has a bearing accommodating portion 331 for accommodating the bearing 310 (second bearing 310b) and one end connected to the bearing accommodating portion 331 and the other end bent in the axial direction It includes a plurality of leg parts 332 disposed along. The plurality of leg parts 332 are respectively coupled to the stator coupling part 195 of the second diffuser 190b.

Meanwhile, in the present embodiment, the hub 191 of the second diffuser 190b is provided with a communication part 205c that communicates the inside and outside of the hub 191 .

The communication portion 205c is a radial section 210 extending outward from the cylindrical portion 192 along the radial direction of the disk portion 193 of the hub 191 of the second diffuser 190b. And one side is configured to include an axial section 215 extending along the radial section 210 and the other side extending along the axial direction.

In this embodiment, the radial section 210 of the communication part 205c has an inlet 211 communicating with the inside of the disk part 193 of the hub of the second diffuser 190b.

The radial section 210 of the communication portion 205c has an external opening 212 communicating with the outside of the hub 191 .

Accordingly, the air inside the hub 191 of the second diffuser 190b is moved to the outside of the hub 191 through the inlet 211, the radial section 210, and the external opening 212. can

In this embodiment, the communication part 205c may be implemented in a plurality spaced apart along the circumferential direction of the second diffuser 190b. The number of communication units 205c may be, for example, 2 to 15.

In this embodiment, one part (eg, three) of the plurality of communication parts 205c may be formed in the stator coupling part 195.

The axial section 215 includes a first axial section 2151 recessed on the outer surface of the cylindrical portion 192 of the hub 191 of the second diffuser 190b.

The first axial section 2151 includes an outlet 2153 through which air is discharged.

The outlet 2153 is formed to open outward between the plurality of blades 171 of the first diffuser 160 and the plurality of blades 198 of the second diffuser 190b.

Accordingly, the air moved to the outside of the hub 191 of the second diffuser 190b through the inlet 211 and the radial section 210 is moved along the first axial section 2151 and It may flow out to the air passage Pa through the outlet 2153.

The axial section 215 includes a second axial section 2152 recessed on the inner surface of the hub 191 of the first diffuser 160 .

The second axial section 2152 and the first axial section 2151 form a passage through which air moves cooperatively.

In this embodiment, the axial section 215 includes both the first axial section 2151 and the second axial section 2152, so that the hub 161 of the first diffuser 160 The increase in the thickness of and the thickness of the hub 191 of the second diffuser 190b may be suppressed.

The upstream end of the second axial section 2152 is formed to correspond to the outer opening 212 of the radial section 210, and the downstream end extends to the downstream end of the first diffuser 160. do.

With this configuration, when operation is started and power is applied to the stator coil 271, the magnetic force generated by the stator coil 271 and the magnetic force of the permanent magnet 292 interact with the rotor 290, It rotates about the rotation axis 291.

When the rotating shaft 291 is rotated, the impeller 130 is rotated, and air is sucked into the impeller cover 110 through the inlet 112 . The sucked air moves downstream along the outside of the motor 250 via the impeller 130, the first diffuser 160, and the second diffuser 190b.

On the other hand, when the impeller 130 is rotated, the pressure on the downstream side of the impeller 130 is relatively lowered and heated by the motor 250 existing between the second diffuser 190b and the motor 250. After moving along the inlet 211, the radial section 210, and the axial section 215, the air flows out into the air passage Pa through the outlet 2153.

As a result, the relatively low-temperature air around the motor 250 is introduced between the hub 191 of the second diffuser 190b and the motor 250, and in this process, the relatively low-temperature air and When the motor 250 is contacted, the motor 250 may be cooled.

According to this configuration, when the impeller 130 rotates, the air between the second diffuser 190b and the motor 250 continuously passes through the communication part 205c to the hub of the second diffuser 190b ( 191), the motor 250 is continuously cooled, and the motor 250 can be operated at a relatively low temperature.

As a result, an increase in electrical resistance due to a high temperature of the motor 250 is suppressed, so that the output of the motor 250 can be improved.

In the foregoing, specific embodiments of the present invention have been shown and described. However, since the present invention can be embodied in various forms without departing from its spirit or essential characteristics, the above-described embodiments should not be limited by specific details for implementing the invention.

In addition, even if the embodiments are not listed one by one in the detailed description described above, they should be widely interpreted within the scope of the technical idea defined in the appended claims. And, all changes and modifications included within the technical scope of the claims and their equivalents should be covered by the appended claims.

Claims (26)

impeller;
a first diffuser disposed downstream of the impeller;
a second diffuser provided downstream of the first diffuser;
an impeller cover coupled to the second diffuser to accommodate the impeller and the first diffuser therein; and
A motor provided on the downstream side of the second diffuser to rotate and drive the impeller;
The second diffuser includes a hub, an outer wall concentrically disposed outside the hub, and a plurality of blades, one side of which is connected to the hub and the other side of which is connected to the outer wall,
The impeller cover is coupled to the outer wall of the second diffuser,
The motor assembly of claim 1 , wherein the hub of the second diffuser is provided with a communication portion for communicating an inside and outside of the hub of the second diffuser. According to claim 1,
The first diffuser includes a tubular hub having one side opened along an axial direction and a plurality of blades provided on an outer wall of the hub,
The motor assembly of claim 1 , wherein the hub of the second diffuser is inserted into the hub of the first diffuser to be in surface contact with the hub of the first diffuser. According to claim 2,
A motor assembly having a bearing accommodating portion provided in the hub of the second diffuser. According to claim 3,
The second diffuser is a motor assembly formed of a member having excellent thermal conductivity compared to the first diffuser. According to claim 3,
A motor assembly in which the second diffuser is provided with a heat dissipation fin protruding to increase a surface area. According to claim 5,
The radiating fin is a motor assembly having a radial radiating fin having one end connected to the circumference of the bearing accommodating portion and the other end disposed in a radial direction. According to claim 5,
The motor assembly having a circumferential radiating fin disposed on an inner surface of the hub of the second diffuser along a circumferential direction. According to claim 5,
The motor includes a stator and a rotor rotatably disposed inside the stator,
A motor assembly having a stator coupling part coupled to the stator at the hub of the second diffuser. According to claim 8,
The stator coupling portion is composed of a plurality of pieces spaced apart along the circumferential direction of the stator,
The stator coupling portion motor assembly having an outer circumferential surface contact portion that is in surface contact with an outer circumferential surface of the stator. According to claim 9,
The stator coupling portion is a motor assembly having an end surface contact portion that is in surface contact with one end of the stator along an axial direction. According to claim 10,
The stator coupling portion motor assembly having one end connected to the bearing receiving portion and the other end having a radial section extending in a radial direction. According to claim 11,
The stator coupling portion has an axial section extending in an axial direction from the radial section,
The outer circumferential contact portion is formed on the inner surface of the axial section of the motor assembly. According to claim 12,
The motor assembly wherein the end surface contact portion is formed in the axial section so as to protrude further inward along the radial direction compared to the outer circumferential surface contact portion. According to claim 7,
A motor assembly in which fastening member insertion holes penetrating along the axial direction are formed through each of the first diffuser and the second diffuser so that the fastening member can be inserted. According to claim 2,
A motor assembly in which the plurality of blades of the first diffuser are formed such that an upstream end and a downstream end of two adjacent blades along a circumferential direction overlap along an axial direction. According to claim 15,
The motor assembly of the plurality of blades of the second diffuser is arranged so that the upstream end and the downstream end of the two blades adjacent along the circumferential direction are spaced apart from each other along the circumferential direction. According to claim 2,
A motor assembly in which a length of a blade of the second diffuser is shorter than a length of a blade of the first diffuser. According to claim 2,
The impeller cover,
an impeller accommodating portion in which the impeller is accommodated;
a suction part extending in an axial direction from an upstream end of the impeller accommodating part and sucking air; and
A motor assembly having a first diffuser accommodating portion extending in an axial direction from a downstream end of the impeller accommodating portion and accommodating the first diffuser. According to claim 18,
The impeller accommodating portion is formed in a conical shape corresponding to the shape of the impeller, and the suction portion and the first diffuser accommodating portion are formed in a cylindrical shape. According to claim 18,
A motor assembly wherein radially outer ends of the blades of the first diffuser are formed to face the inner circumferential surface of the first diffuser accommodating portion or come into contact with the inner circumferential surface of the first diffuser accommodating portion. According to claim 2,
The hub of the first diffuser is provided with a through portion penetrating along an axial direction,
A motor assembly comprising a protrusion protruding along an axial direction at a hub of the second diffuser and being inserted into the through portion. According to claim 21,
An anti-rotation protrusion protruding along an axial direction is formed on one of the mutual contact surfaces of the hub of the first diffuser and the hub of the second diffuser, and the anti-rotation protrusion is accommodated in the other of the mutual contact surfaces. A motor assembly provided with a receiving groove. According to claim 21,
A motor assembly comprising a bearing accommodating portion for accommodating a bearing on a rear surface of the protruding portion of the second diffuser. The method of any one of claims 2 to 23,
The communication part is formed between the blades of the first diffuser and the blades of the second diffuser along the axial direction. The method of any one of claims 1 to 23,
The hub of the second diffuser includes a cylindrical portion and a disk portion formed to block one end of the cylindrical portion,
The communication part,
One side is opened to the inside of the disk portion and the other side is a radial section extending outwardly of the cylindrical portion along the radial direction of the disk portion, and
One side of the motor assembly having an axial section communicating with the radial section and the other side extending along the axial direction. According to claim 25,
The axial section may include a first axial section depressed in the outer surface of the second diffuser and communicating with the radial section or a second axial section communicating with the radial section and depressed in the inner surface of the hub of the first diffuser. A motor assembly having a section.

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